This name is a synonym of Caulanthus heterophyllus (Nutt.) Payson.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bot. Jahrb. Syst. 66: 98 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:114757-2.
This name was in version 1 of The Plant List, record kew-2834958.